The yearly summary pages in the following will continuously monitor this problem .
Basic knowledge about global warming.
http://www.aip.org/history/climate/
Consensus Statements by International Workshop on Tropical Cyclone-VI (IWTC-VI) Participants.
http://www.wmo.ch/web/arep/press_releases/2006/iwtc_statement.pdf
The website of IPCC. The latest IPCC fourth assessment report can be downloaded for free.
http://www.ipcc.ch/
Jpan Meteorological Agency. The summary of IPCC fourth assessment report above is translated into Japanese.
http://www.data.kishou.go.jp/climate/cpdinfo/ipcc/ar4/
Scripps Institution of Oceanography. History of CO2 measurement by Keeling, historical data, and many more.
http://scrippsco2.ucsd.edu/home/
Provides observed time series data of greenhouse gases. Maintained by Japan Meteorological Agency in cooperation with the World meterological Organization.
http://gaw.kishou.go.jp/wdcgg/wdcgg.html